Printed circuit assembly



I y 1960 B. H. GRIFFITH, JR 2,939,051

PRINTED CIRCUIT ASSEMBLY Filed Sept. 3, 1958 2 Sheets-Sheet 1 JJGLZ INV EN TOR. 5. H. GE/FF/TH, Je.

Lu, W wy May 31, 1960 B. H. GRIFFITH, JR

PRINTED CIRCUIT ASSEMBLY Filed Sept. 3, 1958 2 Sheets-Sheet 2 INVENTOR. B. H. GE/FF/T I, JE

2,939,051 PRINTED CIRCUIT ASSEMBLY Ben H. Griflith, Jr., Baltimore, Md., assignor, by mesne assignments, to the United States of America as represented by the Secretary of the Air Force Filed Sept. 3, 1958, Ser. No. 758,872 3 Claims. (Cl. 317101) This invention relates to a printed circuit assembly having separate shielding means for the printed circuit, tubes and other circuit components.

One object of the inventionis to provide a printed circuit assembly wherein a circuit shielding element is mounted in close proximity to the printed circuit.

Another object is to provide a printed circuit assembly wherein the tubes are mounted on the same side of the board as the printed circuit to provide good ventilation and cooling for the tubes. 7

A further object of the invention is to provide a printed circuit assembly wherein the shields are easily removed to make the parts more accessible.

These and other objects will be more fully understood 7 from the following detailed description taken with the drawing wherein:

Fig. l is an isometric view of a bly according to the invention.

Fig. 2 is an exploded view of the printed circuit assembly of Fig. 1.

Fig. 3 is an isometric view of the bottom shield for the device of Fig. 1.

Fig. 4 is a top view of the printed circuit panel for the device of Fig. 1. t

Fig. 5 is a side view of the panel of Fig. 4.

Fig. 6 is a top view of the upper shield used in the device of Fig. l.

Referring more particularly to Fig. 1 of the drawing, the circuit assembly 10 has; a panel 11 on which the printed circuit, tubes and other circuit components are printed circuit assemence to Fig. 4, a bottom shield 12, a top shield 13, tube a pair of members 16 and 17 for panel 11. The bottom shield 12, as shown in Fig. 3, has two members 21 and 22 for securing the shield to the panel member 11 and for making electrical contact therewith. The shield 12 may have partitions therein to isolate any particular sections of the circuit from the other sections of the circuit, as may be desired.

Figs. 4 and 5 of 11 aving a printed is merely illustrative and is not directed to any particular type of device. Tube mounts 24 and 25 are also mounted on the upper surface of the panel 11. All of the other circuit components are mounted on the other surface of panel 11, have their terminals extending through the panel'and elements of the circuit 27 elements such as potentiometers, and trimmer capacitors, etc. are

and 28 which are variable coils, variable imity to the prmted circuit and coupling due to the length of the leads and coupling due 2,939,051 Patented May 31, 1960 to the electrical and magnetic fields of the circuit. The tube shields 14 and 15 contact the glass envelope of the tubes and thereby tend to cool the tubes. By mounting the tubes on the upper surface of the shield they are exposed to better ventilation.

There is thus provided a printed circuit assembly in which the printed circuit shielding element is mounted in close parts readily accessible.

Though one specific embodiment has been described in some detail, it is to be understood that numerous changes may be made without departing from the general principles and scope of the invention.

What is claimed is:

1. A printed circuit assembly, comprising; a circuit ber inclosing components on said otherside of said support panel, means for securing said first shield to said support panel, a second shield located in close to said printed circuit and said tubes and said control 2. A printed circuit assembly, comprising; a circuit support panel, a printed circuit on one surface of said support panel, means for mounting the electron tubes said support panel, therethrough for the control shafts for the variable elements within said circuit, a first shield member for inshield having means thereon for securing said tube shieldl thereto.

References Cited in the file of this patent UNITED STATES PATENTS 2,066,876 Carpenter Jan. 5, 1937 2,468,727 Bauman May 3, 1949 2,586,854 Myers Feb. 26, 1952 

